Hay Klemen, I found some bugs for 1.8.3
The first issue is global variables for GUIs crash due to some bit of code not formatted right according to forge.
I don't think this is a user side error as I have been able to narrow it down to adding a text variable to the GUI with a global variable option.
I have left that bug in the GUI for your testing.
If you remove the variable it will work fine again.
So the other bug is also to do with the global variables and this is an odd one but I was able to use overlays to display the global variable numbers as guides were not working.
and in 1.8.3 adding to a global variable just does not work at all, even though the same code using subtraction will work fine.
One more thing I just want to throw past you is a brief feature request I can make a new post for your records but I want to know if you will be adding support for blocks to call other block procedures for that specific coordinate block.
global works fine for some things but it's more fit for server-wide variables, not local server variables if you get what I mean. Basically, there is no way to target a block far as I know for its variable to edit or change its variable remotely or via other connected blocks such as wires.
Anyhow, let me know if you would consider adding that feature and if so I will make a new thread for that particular feature request for your record.